Blackboard-eraser.



0.1. DAY.

BLACKBOARD ERASER.

`APPLICATION FILED FEB.13. 1913.

Patented 111815116, 1916.

WITNESSES [N VEN TOR All fomey Tm: COLUMBIA PLANDGPAPH co., WASHINGTON. D. C.

D STATESATENT orrrcu.

OLIVER .T VDAY, or rzncrnnrnz,y NORTH DAKOTA.

IBLACKBOARDeEER'ASER.

ley, in the countyof Lamoure and State of` North Dakota, have invented certain new and useful Improvements in Blackboard- Erasers, of which thel following is a speci-k fication.

This erasers, and has for its objectftofsimplify the construction of devices ofthis character, and render same practically dustless, at the same time provide means whereby the y-parts'fmay'be removed and duplicated,

economy and cleanliness.

-The above and-additional objects are accomplished by such means as are illustrated in their preferred embodiment in the accompanying drawings, described in the following specification, and then more particularly pointed out in the claims which are appended hereto and form a part of this application.

In describing my invention in detail reference will be had to the accompanying drawings wherein like characters denote like or corresponding parts throughout the several views, and in which Figure l is a perspective view of an eraser constructed in accordance' with my invention. Fig. 2 is a side elevation, the frame casing being shown in section, and Fig. 3 is a section on line 3-3 of Fig. 2.

Before proceeding with the description of the drawings I desire to call particular attention to the fact that while I have evolved my invention with particular reference to its application in connection with the cleaning of blackboards, the same may be readily utilized for the purpose of cleaning slates and other similar articles or devices.

Referring now to the drawings, the numeral l designates the outer casing or frame of the eraser, substantially rectangular in shape and provided with an open face for the purpose of receiving the erasing pads employed in vconnection with the invention. The said casing is preferably covered with any soft material such asis shown at 2 in the drawings, the same being glued, stitched or otherwise secured upon the exterior of the casing. Disposed within the said casing, when the device is properly assembled, and retained therein by reason of its frictional Specification of Letters Patent.

invention relates to blackboard therewith and projecting outwardly from the upperedge thereof. In fitting the frame within the casing theedges-of the latter are arranged to fit` beneath the said flanges thereby maintaining the frame in proper place within the casing. "Mounted within the frame and held therein by frictional enn Patented May 16, 1916.

Application led February 13. 1913. Serial No. 748,227.

gagement I provide a 4 plurality of uniformly spaced parallel bars 5, each of which 'is' covered with a ystrip 6 of any soft downy thereby enhallmg its value as to durability," '1

material, the free ends of each strip projecting beyond the edge of the frame as at 7 so as to form an erasing pad or the contacting surface of the device. Any suitable means such as the staples or pins shown at 8 may be employed for fastening the strips in proper place upon the bars 5.

A comparatively large iat strip of material 9 kis interposed between the inner face of the casing l and the ends of the strips 6, which strips are rendered by the application of oil or other suitable liquid thereupon, capable of impregnating the erasing surface 7 of the strips and rendering the same capable of performing the required function to better advantage, as well as eliminating the accumulation of dust to a marked degree.

From the above description, taken in conl nection with the accompanying drawings it will be seen that theerasing pads or strips may be freely removed for cleaning the same or for the purpose of applying liquid to the pad or strip 9; that by reason of the tight or frictional engagement between the said strips and the inner wall of the frame, the former are held in proper place therein; and that by application of liquid to the strip 9, the same will impregnate the erasing pads or strips 6 by reason of their engagement or contact therewith.

Although the strip 9 is shown and described as forming a part of my invention, the same may be readily omitted, and the device used for the purpose for lwhich it is designed;.however, the provision of the said stri-p will materially increase the efficiency and cleaning power of the eraser to a marked degree.

It will be understood that the above description and the accompanyingk drawings comprehend only the general and preferred ous minor changes in the details of construction, proportion and arrangement of parts may be made within the scope of the appended claims and without sacrificing any of the advantages of my invention.

Having thus fully described my invention, what I claim as new and desire to 'secure by Letters Patent, isz- 1. In an eraser', a holder, a strip of absorbent material held withinthe said holder, a plurality of uniformly spaced bars disposed withinthe said holder,erasing strips arranged to embracethe said barsr and to project eXteriorly of the holder, the said strips being disposed in engagement with the absorbent'material, the said bars and the said strips being maintained within the holder byk reason of their frictiona-l engagenient therewith, as and for the purpose set forth. l

2. An eraserincluding an inner and an outer telescoping holder, a strip of absorbent material disposed within the said inner holder, flanges formed upon the said inner holder adapted to overlap the edges of the said' outer holder, a plurality of uniformly spaced parallel bars disposed within the said inner'holder, erasing strips arranged to embrace the said bars, the said strips adapted to extend beyond the edge of the said inner holder, the said strips and the said bars being maintained Within the said inner holder by reason of their frictional lengagement therewith, and means for fastening the said strips to the said bars, as for the purpose set forth.

In testimony whereof I ailix my signature in presence of two Witnesses. v

OLIVER J. DAY. Vtnesses:

A. J. KESLER, FRED W. PILE.

Copies ofithil patent may be obtained for ve cent: enen, by addressing the Commissioner ot Patents,

f Washington, D. C.` 

